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MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
RAD TOLERANT ULTRA LOW DROPOUT ADJUSTABLE POSITIVE LINEAR REGULATOR
5900RH
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
Total Dose Tested to 300K RAD Ultra Low Dropout for Reduced Power Consumption External Shutdown/Reset Function Latching Overload Protection Adjustable Output Using Two External Resistors Output Current Limit Surface Mount Package Available to DSCC SMD # 5962-05220
DESCRIPTION:
The MSK 5900RH is a rad tolerant adjustable linear regulator capable of delivering 4.0 amps of output current. Typical dropout is only 0.30 volts with a 1.5 amp load. An external shutdown/reset function is ideal for power supply sequencing. This device also has latching overload protection that requires no external current sense resistor. The MSK 5900RH is radiation tolerant to 300K RAD and specifically designed for many space/satellite applications. The device is packaged in a hermetically sealed 12 pin flatpack that is lead formed for surface mount applications.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS TYPICAL APPLICATIONS
Satellite System Power Supplies Switching Power Supply Post Regulators Constant Voltage/Current Regulators Microprocessor Power Supplies
PIN-OUT INFORMATION
1 2 3 4 5 6 1 VIN A VIN B VIN C GND 1 Latch Shutdown 12 11 10 9 8 7 VOUT A VOUT B VOUT C GND 2 GND 2 FB Rev. F 2/06
ABSOLUTE MAXIMUM RATINGS
+VIN IOUT TC
10
ELECTRICAL SPECIFICATIONS
Parameter Input Voltage Range 2 8 Test Conditions 1 9 10mA IOUT 1.0A 10mA IOUT 1.0A R1=187 VFB=1.265V 10mA IOUT 1.0A VIN=7.5V Not Including IOUT Line Regulation IOUT=10mA 2.8V VIN 7.5V R1=187 Load Regulation 10mA IOUT 1.0A Group A Subgroup 1 2,3 Feedback Voltage 1 2,3 Feedback Pin Current 2 Quiescent Current 1,2,3 1 2,3 1 2,3 1 2,3 Dropout Voltage Delta FB=1% IOUT=1.0A 1 2,3 Minimum Output Current 2 2.8V VIN 7.5V R1=187 Output Voltage Range 2 Output Current Limit
7
MSK5900K/H/E Min. 2.8 2.8 1.225 1.225 0 1.5 1.5 1.3 1.0 1.0 20 20 30 10 Typ. 1.265 14 14 Max. 7.5 7.5 Min. 2.8 -
MSK5900 Typ. 1.265 14 0.01 0.06 0.22 8 1.75 1.3 0.02 70 18 6.9 Max. 7.5 1.328 5.0 20 -
1.305 1.202 1.305 5.0 20 20 0 1.5 1.3 1.0 20 30 10 -
0.01 0.50 0.50
0.60 %VOUT %VOUT
0.06 0.80 0.22 0.26 8 9 1.75 1.75 1.3 1.3 0.02 0.03 70 18 6.9 0.80 0.70 0.70 10 10 6.8 2.0 2.2 1.6 1.6 0.2 0.2 50 7.5
1.0 %VOUT 0.75 10 6.7 2.2 1.6 0.2 50 7.8 %VOUT V V mA mA V A A V V V V dB dB degrees dB VRMS C/W
1 2,3 1 2,3
VIN=7.5V VIN=4.4V VOUT=3.3V
Shutdown Threshold
VOUT 0.2V (OFF) VOUT=Nominal (ON)
1 2,3 1 2,3 4 5,6 4,5,6 4,5,6
Shutdown Hysteresis
Difference between voltage threshold of VSDI (ON) and VSDI (OFF)
Ripple Rejection 2
f=1KHz to 10KHz 10mA IOUT 1.0A 1.0V=VIN-VOUT
Phase Margin 2 Gain Margin 2 Equivalent Noise Voltage 2 Thermal Resistance 2 Referred to Feedback Pin Junction to Case @ 125C Output Device
4,5,6 -
NOTES:
1 2 3 4 5 6 Unless otherwise specified, VIN=5.0V, R1=1.62K, VSHUTDOWN=0V and IOUT=10mA. See Figure 2. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise requested. Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2,3 and 4. Subgroup 5 and 6 testing available upon request. Subgroup 1,4 TC=+25C Subgroup 2,5 TC=+125C Subgroup 3,6 TA=-55C Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves. Minimum VIN at -55C and IOUT=1.0A is 4.0V due to current limit circuitry. Consult factory for post radiation limits. Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
7 8 9 10
2
Rev. F 2/06

PD TC

Supply Voltage +10V Output Current 7 4A Case Operating Temperature Range MSK5900RH K/H/E -55C to +125C MSK5900RH -40C to +85C

TST TLD
Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Power Dissipation See SOA Curve Junction Temperature 150C
Units V V V V A mA mA
APPLICATION NOTES PIN FUNCTIONS
VIN A,B,C - These pins provide power to all internal circuitry including bias, start-up, thermal limit and overcurrent latch. Input voltage range is 2.8V to 7.5V. All three pins must be connected for proper operation. GND1 - Internally connected to input ground, these pins should be connected externally by the user to the circuit ground and the GND2 pins. LATCH - The MSK 5900RH has a timed latch-off circuit which provides overcurrent protection. An overcurrent or output short condition will saturate the internal drive transistor. The time-out latch will then be triggered and turn off the regulator. The time-out period is determined by an external capacitor connected between the latch and GND pins. Once the overcurrent condition is removed, the latch can be reset by pulling the SHUTDOWN pin high, grounding the LATCH pin or cycling power off, then on. Under normal conditions, the voltage at the LATCH pin is zero. When the device is latched off, the voltage at the LATCH pin will be 1.6V at 25C. SHUTDOWN - There are two functions to the SHUTDOWN pin. It may be used to disable the output voltage or to reset the LATCH pin. To activate the shutdown/ reset functions the user must apply a voltage greater than 1.3V to the SHUTDOWN pin. The output voltage will turn on when the SHUTDOWN pin is pulled below the threshold voltage. If the SHUTDOWN pin is not used, it should be connected to ground. FB - The FB pin is the inverting input of the internal error amplifier. The non-inverting input is connected to an internal 1.265V reference. This error amplifier controls the drive to the output transistor to force the FB pin to 1.265V. An external resistor divider is connected to the output, FB pin and ground to set the output voltage. GND2 - Internally connected to output ground, these pins should be connected externally by the user to the circuit ground and the GND1 pins. VOUT A,B,C - These are the output pins for the device. All three pins must be connected for proper operation.
OUTPUT CAPACITOR SELECTION
Typically, large bulk capacitance is required at the output of a linear regulator to maintain good load transient response. However, with the MSK 5900RH this is not the case. A 47F surface mount tantalum capacitor in parallel with a 0.1F ceramic capacitor from the output to ground should suffice under most conditions. If the user finds that tighter voltage regulation is needed during output transients, more capacitance may be added. If more capacitance is added to the output, the bandwidth may suffer.
OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR SELECTION
As previously mentioned, the LATCH pin provides over current/output short circuit protection with a timed latchoff circuit. The latch off time out is determined with an external capacitor connected from the LATCH pin to ground. The time-out period is equal to the time it takes to charge this external capacitor from 0V to 1.6V. The latch charging current is provided by an internal current source. This current is a function of input voltage and temperature (see latch charging current curve). For instance, at 25C, the latch charging current is 7.2A at VIN=3V and 8A at VIN=7V. In the latch-off mode, some additional current will be drawn from the input. This additional latching current is also a function of input voltage and temperature (see latching current curve). FIGURE 1
POWER SUPPLY BYPASSING
To maximize transient response and minimize power supply transients it is recommended that a 33F minimum tantalum capacitor is connected between VIN and ground. A 0.1F ceramic capacitor should also be used for high frequency bypassing.
3
The MSK 5900RH current limit function is directly affected by the input and output voltages. Figure 1 illustrates the relationship between VIN and ICL for three output voltages.
Rev. F 2/06
APPLICATION NOTES CONT. THERMAL LIMITING TYPICAL APPLICATIONS CIRCUIT
The MSK 5900RH control circuitry has a thermal shutdown temperature of approximately 150C. This thermal shutdown can be used as a protection feature, but for continuous operation, the junction temperature of the pass transistor must be maintained below 150C. Proper heat sink selection is essential to maintain these conditions.
HEAT SINK SELECTION
To select a heat sink for the MSK 5900RH, the following formula for convective heat flow may be used.
Governing Equation:
TJ = PD X (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA TA VOUT=1.265(1+R1/R2)
= = = = = =
Junction Temperature Total Power Dissipation Junction to Case Thermal Resistance Case to Heat Sink Thermal Resistance Heat Sink to Ambient Thermal Resistance Ambient Temperature
OUTPUT VOLTAGE SELECTION
As noted in the above typical applications circuit, the formula for output voltage selection is VOUT=1.265 1+ R1 R2 A good starting point for this output voltage selection is to set R2=1K. By rearranging the formula it is simple to calculate the final R1 value. R1=R2 VOUT -1 1.265
Power Dissipation=(VIN-VOUT) x IOUT Next, the user must select a maximum junction temperature. The absolute maximum allowable junction temperature is 150C. The equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (RSA).
Table 1 below lists some of the most probable resistor combinations based on industry standard usage.
Example:
An MSK 5900RH is connected for VIN=+5V and VOUT=+3.3V. IOUT is a continuous 1A DC level. The ambient temperature is +25C. The maximum desired junction temperature is +125C. RJC=7.5C/W and RCS=0.15C/W for most thermal greases Power Dissipation=(5V-3.3V) x (1A) =1.7Watts Solve for RSA: RSA= 125C - 25C -7.5C/W - 0.15C/W 1.7W = 51.2C/W In this example, a heat sink with a thermal resistance of no more than 51C/W must be used to maintain a junction temperature of no more than 125C. TABLE 1 OUTPUT VOLTAGE (V) 1.5 1.8 2.0 2.5 2.8 3.3 4.0 5.0 R2 () 1K 1K 1K 1K 1K 1K 1K 1K R1 (nearest 1%) () 187 422 576 976 1.21K 1.62K 2.15K 2.94K
4
Rev. F
2/06
TYPICAL PERFORMANCE CURVES
5
Rev. F 2/06
RADIATION PERFORMANCE CURVES
6
Rev. F 2/06
MECHANICAL SPECIFICATIONS
MSK5900RH
WEIGHT=3.3 GRAMS TYPICAL
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED. ESD Triangle indicates pin 1.
ORDERING INFORMATION
Part Number MSK5900RH MSK5900ERH MSK5900HRH MSK5900KRH DSCC SMD Screening Level INDUSTRIAL EXTENDED RELIABILITY MIL-PRF-38534 CLASS H MIL-PRF-38534 CLASS K 5962-05220
The above example is a Military grade hybrid.
NOTE: See DSCC SMD 5962-05220 for DSCC part number options.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. Please visit our website for the most recent revision of this datasheet. Contact MSK for MIL-PRF-38534 Class H, Class K and Appendix G (radiation) status.
7
Rev. F 2/06

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